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Re: Meet Osram 50035 Ministar Axial-Reflektor

They sell for $6.09 here, but minimum quantity is a case. (www.alldaylighting.com) I had not heard of this outfit before. Delivered case price is $85.50 ($11.70 Priority Mail Shipping), checkout with PayPal (I.E. works better). I used my credit card for protection.

It is yet another interesting ican strategy that is unique, and different than Osram's IRC technology. With the metalic coating in the base acting as a reflector, there should be much better output, and reflector may not even matter all that much. Unfortunately, my destructive testing may not be as useful, given the unique construction.

I ordered a case of 50W (#50050), but I can see one limiting problem you have to be careful with, namely they have a diameter of 16mm (0.62") bore required. Since the base is narrower, perhaps you could carefully insert them from inside the reflector, keeping the wider top from going through bore. I'll update the bottom diameter if Stefan has not already done this.

Re: Meet Osram 50035 Ministar Axial-Reflektor

unless you drill the reflector to slightly more than 16mm the only way is to insert it carefully with the reflector in place, aka down throgh the reflector.

I found the 50w variety locally but I like the 35w more since it has a longer runtime. I'll try to do some draw etc. measurements.

The reflector do matter, but the internal reflector so close to the filament puts more of the light forward. I feel that the big reflector manage to concentrate the light better and produce more throw with this bulb.

Re: Meet Osram 50035 Ministar Axial-Reflektor

I'm curious to see how this bulb performs outdoors. Especially against it's 50watt big brother. Out of curiosity, how many volts are you sending to the bulb? And at what current? (I see they are rated for 12volts.)

Re: Meet Osram 50035 Ministar Axial-Reflektor

Originally Posted by maxspeeds

I'm curious to see how this bulb performs outdoors. Especially against it's 50watt big brother. Out of curiosity, how many volts are you sending to the bulb? And at what current? (I see they are rated for 12volts.)

Battery draw on the 35w is 3.10A running on a 12AA eneloop pack that measures 15.5V at the moment. No ill effects from running on ~15V so far in my testing.
I don't think there's going to be much difference to the eye between the 35w and the 50w. To my eyes the 35w ministar just murder my 50w IRC bulbs.

Re: Meet Osram 50035 Ministar Axial-Reflektor

Some crude beamshots on a ceiling 2 metres away. The beams really don't look this bad in real life. And remember that I always use smooth reflectors with my OSRAM bulbs. LOP or whatever structured you like will make the beams nicer.

Re: Meet Osram 50035 Ministar Axial-Reflektor

I've tried the 35w on 4 x LiION D and it survived. I charge my cells on an RC charger setup so it's 4 x 4.20V, that was no problem at all..

My 12AA eneloop packs are somewhat over 17V hot off the charger. No problems with the 35w.

Sweet! Now I need to acquire a few of these to have some fun This is such an awesome looking incan. I'm surprised it took this long for the development of a bulb with a built in reflector to the envelope.

Re: Meet Osram 50035 Ministar Axial-Reflektor

Originally Posted by StefanFS

Some crude beamshots on a ceiling 2 metres away. The beams really don't look this bad in real life. And remember that I always use smooth reflectors with my OSRAM bulbs. LOP or whatever structured you like will make the beams nicer.

The Ministar is tighter with a hotter hotspot.

Any chance of a beamshot at the same parameters, but with a naked bulb (no reflector)?

I'm wondering how these would work, with the ~30 degree beam from the bulb refocused to a tighter beam through a lens, instead of the dual-reflector setup. Particularly considering the axial filament (although the filament itself wouldn't even be in focus), I think you might get a nice beam that way.

Re: Meet Osram 50035 Ministar Axial-Reflektor

Good beamshots. But to me it looks like the 50W IRC has a 'hotter' hotspot. But, I realize that what I see on my PC monitor will be different that what you seeing 'live.' Still looks like a good bulb to play around with!

Re: Meet Osram 50035 Ministar Axial-Reflektor

OK, this seller I linked above is a good deal....got my dozen bulbs today. These are quite an impressive engineering feat with the beautiful chrome colored metal at base of bulb and onto upper stem. It just looks of very high quality.

The stem part is 0.457" (11.62mm), so my idea of using a smaller 0.5" bore reflector and CAREFULLY (as in use a white cotton glove) inserting bulb through the reflector is a possibility.

Re: Meet Osram 50035 Ministar Axial-Reflektor

Originally Posted by kris23

are all of you guys using stock profile SMO reflectors? im planning on on using these or the IRC bulbs in a 16-18 cell 6D mag with AW soft start

Generally, the larger >50W bulbs do better with a light OP or Stipple surface because these are essentially projector bulbs normally focussed with a lens. Every bulb is different. I'll be trying this bulb without reflector, and with several size and surface reflectors after the holiday.

Re: Meet Osram 50035 Ministar Axial-Reflektor

Actually was fairly easy to insert bulb from inside the reflector. Just wear a soft cotton glove, and I gently let bulb slide down inside of tilted reflector, and lined up bipins with socket, then held gentle pressure on bulb as I uprighted light. Then even inserting it in Modamag's 4" Colossus reflector (0.5" bore) was easy with gentle, straight down pressure. To remove cooled bulb, I got a short length of kite string, tied a single knot making a noose, draped it down over head of bulb, cinched up the loop, then bulb came out with slow, steady pulling on string.

Stefan is right that the bulb then does benefit from focussing. I just tried it with 4s Emoli 18650 cells, using AW's multi-level driver to see that this is a spectacular bulb able to go into a very nice hotspot. I didn't want to push the voltage until I test this 50W in my Destructive bulbs setup to see where it flashes, and what kind of lumens/amps readings I get. I don't have any 35W to test.

Once I know how high it can be cranked up, then I can take some "proper" beam/outdoor shots. There is no question that the 4 x Emoli IMR's were just frolicking with its' filament.

We see that this bulb puts out 1400 candela with radiation angle of 30° (also has life of 2,000hrs and color temp of 3,000 K). Going back to the WIKI page, there is a conversion table at the bottom if you know the beam angle, which in this case 30° uses 4.67.

Re: Meet Osram 50035 Ministar Axial-Reflektor

It looks like the "Sweet Spot" is to drive this bulb and the IRC version at 19-20V. With such low amp's, even AWR's old regulated "Hotdriver" could be used, while we wait for AlanB's project.

So some beamshots using Emoli/A123 cells set at same regulated voltage in same mag setup/reflector should show differences. I think the Ministar will have a better hotspot, but has virtually the same gorgeous color as the IRC.

Re: Meet Osram 50035 Ministar Axial-Reflektor

It is a worthy contender. Only limitation is needing to insert it carefully through a reflector with a 0.5" bore. (See my earlier post, also the tip about using a soft string noose for removal).

I will be setting one of these ministar bulbs up with regulation. So many bulbs can be used now that we have regulation again! I have to get used to this new resource. This larger Ministar bulb is one you want to adjust POT voltage with JimmyM's PhD without head/reflector until you are happy with its output. I'll be starting at 6s2p x 18650 in an elephant.